I hadn't heard of this technology! It is still very much in the theoretical stage, but is still interesting to think about. Elon Musk, the man behind Space X and Tesla motors, wants to build an ultra fast transportation system based on vacuum tubes and the magnetic levitation system already in use on high speed trains. Capsules containing four to six people would travel through these vacuum tubes completely free of both metal and wind friction as speeds up to 4000 MPH! It sounds like a great idea... I'll reserve my judgement until I see if they can get it to work.